These fine gentleman are simultaneously the dumbest and most awesome concept I have ever seen, no lie. A psychopath and a racist with a symbiotic link granted by a metal-eating alien. Oh, and they're dead now, thanks to the Scourge of the Underworld. Not much potential there, right?
Well, no. Otherwise this would post would be unnecessary.
See, Hammer and Anvil provide a writer with a chance to do 'buddy-cop' style hijinks in a book that might not necessarily provide an outlet for such (Hulk, for instance.). One's a dumb racist and the other's a hardened career criminal-it'll be like Lethal Weapon for the superpower set, only without Danny Glover's rampant nudity or Mel Gibson's hair.
Really, they're worth having around for the comedic value alone, but, in a pinch, there are other factors that might prove interesting...the Synthecon which binds the two men together is an alien artifact of unknown ability, meaning it can likely serve as a handy tool for resurrecting them as well as furthering their story.
In fact, picture this...somewhere in the Nevada Desert, a trio of casino roughs prepare to bury the body of a troublemaker. In the process, they disturb the lonely grave of our dynamic duo and discover what appears to be an alien cocoon hidden beneath the soil. The cocoon ruptures and Hammer and Anvil emerge, alive and very, VERY angry. The Synthecon has healed them of the gunshot wound and feedback that killed them, but it has also scrambled their minds a bit.
Being linked as they are, the Synthecon can't tell them apart. So it used bits from one to heal the mind of the other, leading to the two men sharing more than a length of alien steel. And, as a capper, this process, once started, has become ongoing...the two men are becoming one, in body as well as mind. One brain with two bodies...and soon, perhaps only one body. A body that won't be human anymore, and certainly won't be Hammer Jackson or Johnny Anvil.